PHP Function

I am trying to change the user role in wordpress after user buys one of 3 items. Each Iteam is like a membership, the only user that can't never be changed is the Admin. I have an Idea of the function I need but it is not working somehow. This should be a very very very easy job for a full time programmer. Being that this is an extremelly easy job I will not pay a lot of money for a 15 minutes job, so proce accordingly please. add_action( 'woocommerce_order_status_completed', 'change_role_on_purchase' ); function change_role_on_purchase( $order_id ) { $order = wc_get_order( $order_id ); $items = $order->get_items(); $user_meta=get_userdata($user_id); $user_roles=$user_meta->roles; $products_to_check = array( 349, 162, 317 ); foreach ( $items as $item ) { if ( $order->user_id > 0 && in_array( 349, $products_to_check ) ) { $user = new WP_User( $order->user_id ); // Change role $user->remove_role($user_roles); $user->add_role( 'Free Plan' ); } if ( $order->user_id > 0 && in_array( 162, $products_to_check ) ) { $user = new WP_User( $order->user_id ); // Change role $user->remove_role($user_roles); $user->add_role( 'Standard Plan' ); } if ( $order->user_id > 0 && in_array( 317, $products_to_check ) ) { $user = new WP_User( $order->user_id ); // Change role $user->remove_role($user_roles); $user->add_role( 'Premium Plan' ); // Exit the loop } } }